window.onload = function(){
	document.getElementsByClassName("box")[0].onmousemove = function(){
		alert("stypes");
		this.style.backgroundColor = "red";
		this.innerHTML = "鼠标向上移";
		this.style.color = "#fff";
		this.style.fontSize = "80px";
		this.style.textAlign = "centrer";
		this.style.lineHeight = "500px";
		this.style.borderRadius = "50%";
		this.style.transition = "3s"
		
	}
	document.getElementsByClassName("box")[0].onmouseout = function(){
		this.style.backgroundColor = "green";
		this.style.innerHTML = "鼠标移开";
		this.style.borderRadius = "20%";
		this.style.transition = "2.5s";
	}
}
